in_voltageX_scale is supposed to give scaled voltages. This was missing in the driver and has been added. Current patch is fixed to scale for 1.8V AVDD.
Signed-off-by: Zubair Lutfullah <[email protected]> --- drivers/iio/adc/ti_am335x_adc.c | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-) diff --git a/drivers/iio/adc/ti_am335x_adc.c b/drivers/iio/adc/ti_am335x_adc.c index 1f83cf7..8a63203 100644 --- a/drivers/iio/adc/ti_am335x_adc.c +++ b/drivers/iio/adc/ti_am335x_adc.c @@ -26,7 +26,7 @@ #include <linux/of_device.h> #include <linux/iio/machine.h> #include <linux/iio/driver.h> - +#include <linux/math64.h> #include <linux/mfd/ti_am335x_tscadc.h> struct tiadc_device { @@ -118,7 +118,8 @@ static int tiadc_channel_init(struct iio_dev *indio_dev, int channels) chan->type = IIO_VOLTAGE; chan->indexed = 1; chan->channel = adc_dev->channel_line[i]; - chan->info_mask_separate = BIT(IIO_CHAN_INFO_RAW); + chan->info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_SCALE); chan->datasheet_name = chan_name_ain[chan->channel]; chan->scan_type.sign = 'u'; chan->scan_type.realbits = 12; @@ -190,6 +191,18 @@ static int tiadc_read_raw(struct iio_dev *indio_dev, } } + switch (mask){ + case IIO_CHAN_INFO_RAW : /*Do nothing. Above code works fine.*/ + break; + case IIO_CHAN_INFO_SCALE : { + /*12 Bit adc. Scale value for 1800mV AVDD. Ideally + AVDD should come from DT.*/ + *val = div_u64( (u64)(*val) * 1800 , 4096); + break; + } + default: break; + } + if (found == false) return -EBUSY; return IIO_VAL_INT; -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
